Linking pin for the chain links of vehicle tracks

A linking pin between the track chain links of a vehicle track and the connectors of said links, said pin incorporating at least one ring of a synthetic material coating, said ring being positioned between said pin and at least one of said links and enabling part of the mechanical stresses to which said links are exposed to be absorbed, said pin incorporating at least two supports on either side of said ring, said supports onto which said connectors are fixed, wherein said pin comprises at least one axial bore extending longitudinally from one of said at least two supports to the other one, said bore being blocked on one side and on the other one by closing means and enclosing a material incorporating a liquid phase and enabling the calories that may build up in said ring to be evacuated towards said connectors, the volume of said material in the liquid state being below the total volume of said bore so as to enable said material to circulate.